commissioner

      （委员会的）委员，专员，特派员a member of a commission (= an official group of people who are responsible for controlling sth or finding out about sth)

      警察局长；警长the head of a particular police force in some countries

      （政府部门的）首长，长官the head of a government department in some countries

      （美国体育协会的）总干事，主管人(in the US) an official chosen by a sports association to control it